Influence of variation in precipitation on the δD values of terrestrial n-alkanes on the southern Tibetan Plateau  

作　　者：XIE Ying XU BaiQing WU GuangJian LIN ShuBiao 

机构地区：[1]Institute of Tibetan PIateau Research,Chinese Aeademy of Seienees,Beijing 100085,China [2]Graduate Universiry of Chinese Aeademy of Scienees,Beijing 100049,China

出　　处：《Chinese Science Bulletin》2012年第17期2140-2147,共8页

基　　金：supported by the National Basic Research Program of China (2009CB723901);the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-Q09-03 and KZCX2-YW-146)

摘　　要：A short lake sedimentary core and ice core were recovered from Lake Chen Co and Noijingangsang Glacier,respectively,in the Lake Yamdrok watershed of the southern Tibetan Plateau.Hydrogen isotope ratios of the ice core(δDice) and δD values of terrestrial n-alkanes(δDwax) in the sediments showed a linear correlation(R2 = 0.41,P = 0.047) over the past 80 years,indicating the effect of hydrogen isotope ratios of precipitation(δDp) on δDwax.However,apparent fractionation(εwax-p) values of δDwax relative to δDice increased with decreasing ice core accumulation(amount of precipitation;R2 = 0.65,P = 0.0051),revealing that dry or wet climate variation had a significant impact on δDwax.Thus,precipitation amount and δDp are both important in determining δDwax.A short lake sedimentary core and ice core were recovered from Lake Chen Co and Noijingangsang Glacier, respectively, in the Lake Yamdrok watershed of the southern Tibetan Plateau. Hydrogen isotope ratios of the ice core （δDice） and gD values of terrestrial n-alkanes （δDwax） in the sediments showed a linear correlation （R2 = 0.41, P = 0.047） over the past 80 years, indicating the effect of hydrogen isotope ratios of precipitation （6Dp） on δDwax. However, apparent fractionation （ε-wax-p） values of δDwax relative to δSDice increased with decreasing ice core accumulation （amount of precipitation; R2 = 0.65, P = 0.0051）, revealing that dry or wet climate variation had a significant impact on δDwax. Thus, precipitation amount and δDp are both important in determining

关 键 词：青藏高原南部 正构烷烃 降水量 地面 同位素比值 沉积岩芯 线性相关 气候变化 

分 类 号：P343.3[天文地球—水文科学]